update_image: tweak error message for SNAPSHOT mode unsupported

diff --git a/src/update_image.c b/src/update_image.c
index 85de4249f3435206c3fb46de9e3beff2a12fa490..c24ee1947ba498b9edd0fe0284d4f4580840af14 100644 (file)
--- a/src/update_image.c
+++ b/src/update_image.c
@@ -1234,7 +1234,7 @@ check_add_command(struct wimlib_update_command *cmd,
        /* Currently, SNAPSHOT means Windows VSS.  In the future, it perhaps
         * could be implemented for other types of snapshots, such as btrfs.  */
        if (add_flags & WIMLIB_ADD_FLAG_SNAPSHOT) {
        /* Currently, SNAPSHOT means Windows VSS.  In the future, it perhaps
         * could be implemented for other types of snapshots, such as btrfs.  */
        if (add_flags & WIMLIB_ADD_FLAG_SNAPSHOT) {

-               ERROR("Snapshot mode is only supported on Windows (VSS)");
+               ERROR("Snapshot mode is only supported on Windows, where it uses VSS.");

                return WIMLIB_ERR_UNSUPPORTED;
        }
 #endif
                return WIMLIB_ERR_UNSUPPORTED;
        }
 #endif